Its a bit tricky and I couldn’t figure it out immediately how to do that. To do that go to File->Settings->Editor-> Colors and Fonts->Font. You will notice the font size is greyed out. There you press the save as button on the default or Darcula Scheme. Then press OK, once you do that a copy of the existing profiles is made then you can edit font size.
Hope it helps..
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Tip of the day
I don’t know the key to success, but the key to failure is trying to please everybody.